How to install Ayatana Overlay Scrollbars on ubuntu 11.10 via PPA

Ayatana Scrollbars use an overlay to ensure that scrollbars take up no active screen real-estate. A thumb appears magically when the pointer is in proximity to the scrollbar, for easy desktop-style paging and dragging. The Ayatana initiative, lead by Canonical, is about designing for a more focused desktop experience.